Green Bay quarterback Aaron Rodgers sounded optimistic Wednesday about his chances of playing when the Packers host the Minnesota Vikings on Sunday.Rodgers met the media after receiving treatment during practice at the Don Hutson Center adjacent to Lambeau Field. He said it would be accurate to describe his injury as a sprained left knee. Whether it's more significant is uncertain.Rodgers said he is feeling "a little better every day," but is "pretty sore."Packers coach Mike McCarthy was restrained in his expectations but said with four more days to prepare and knowing Rodgers, he's not ruling anything out."Obviously there's hope of him playing," McCarthy said. "He'll be given the whole week to get ready. We'll take it day by day and learn as we go."He's always responded. We'll see what tomorrow brings."The Vikings are planning to face Rodgers, not backup DeShone Kizer, in what will be quarterback Kirk Cousins' first NFC North game since signing in Minnesota as a free agent in March."Yeah," Zimmer said on a conference call with Green Bay media, "he walks on water, so I'm pretty sure he's gonna play."